DR. LAUREN DEMARIS DO
NPI 1124640107
Internal Medicine in Portsmouth, NH
About Dr. Lauren Demaris Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LAUREN DEMARIS DO (NPI 1124640107) is an individual internal medicine provider in Portsmouth, New Hampshire, licensed in New Hampshire (25384) and active in the NPI registry since May 2020. She is enrolled in Medicare PECOS, is affiliated with Elliot Hospital, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Lauren Demaris Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Lauren Demaris reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Kingston, NH 03848
- Reassigned Medicare billing, New Hampshire enrollment
- 3 clinicians in this Medicare group
Derry, NH 03038
- Reassigned Medicare billing, New Hampshire enrollment
- 150 clinicians in this Medicare group
Concord, NH 03301
- Reassigned Medicare billing, New Hampshire enrollment
- 42 clinicians in this Medicare group
Canton, MA 02021
- Reassigned Medicare billing, New Hampshire enrollment
- 30 clinicians in this Medicare group
Baltimore, MD 21237
- Reassigned Medicare billing, New Hampshire enrollment
- 43 clinicians in this Medicare group
Gardendale, AL 35071
- Reassigned Medicare billing, New Hampshire enrollment
- 41 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Elliot Hospital
Acute Care Hospitals · Manchester, NHPortsmouth Regional Hospital
Acute Care Hospitals · Portsmouth, NHPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 03801 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTSMOUTH, NH 03801
PORTSMOUTH, NH 03801
PORTSMOUTH, NH 03801
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Lauren Demaris's NPI number?
The NPI number for Lauren Demaris is 1124640107. It was assigned to this individual provider in the NPPES registry on May 12, 2020. The provider is also known as Lauren Horsley.
Where is Lauren Demaris located?
Lauren Demaris practices at 333 Borthwick Ave Ste 100, Portsmouth, NH 03801. The listed phone number is (603) 436-5110.
What is Lauren Demaris's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Lauren Demaris enrolled in Medicare?
Yes. Lauren Demaris is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Lauren Demaris's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lauren Demaris reassigns Medicare benefits to 6 organizations: New Creation Healing Center, Inc (Kingston, NH), Hospital Medicine Services Of Nh, LLC (Derry, NH), Genesis Eldercare Physician Services LLC (Concord, NH), Vantage Healthcare LLC (Canton, MA), Alignmed Medical Group, PC (Baltimore, MD) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Lauren Demaris's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Lauren Demaris accept?
Health plans from Anthem Blue Cross and Blue Shield, Taro Health and WellSense Health Plan list Lauren Demaris as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Lauren Demaris affiliated with any hospitals?
According to CMS data, Lauren Demaris is affiliated with Elliot Hospital and Portsmouth Regional Hospital.
When was this NPI record last updated?
The NPPES record for Lauren Demaris was last updated on July 31, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Lauren Demaris, DO · NPI 1124640107
Internal Medicine physician in Portsmouth, New Hampshire. Individual provider, active in the CMS NPPES registry since May 12, 2020.
## Identity
- **NPI:** 1124640107 (Entity type: Individual)
- **Enumerated:** May 12, 2020
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 25384 (New Hampshire)
- **Sole proprietor:** No
## Practice location
- **Address:** 333 BORTHWICK AVE STE 100, Portsmouth, NH 03801-4198
- **Phone:** (603) 436-5110
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): New Creation Healing Center, Inc (NPI 1477569234, Kingston, NH); Hospital Medicine Services Of Nh, LLC (NPI 1548967607, Derry, NH); Genesis Eldercare Physician Services LLC (NPI 1821011792, Concord, NH); Vantage Healthcare LLC (NPI 1366903551, Canton, MA); Alignmed Medical Group, PC (NPI 1366289423, Baltimore, MD); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** July 31, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1124640107) · Data from the CMS NPPES public registry.